Merheba !
1-Me seems u ain't much of Wordpress ! I have to say if u just wanna have several websites u can get the 99$ or 159$ package.
the Ultimate edition is used in very big projects eg-> if u wanna set up an MU wordpress then this package can come in handy ! what does it mean ? i.e u can let as many as people to have classified websites (using this theme). sth like Wordpress.com! my recommend is 159$ package.
2-
These are the available languages but if u don't like the translation
u can learn how to translate it urself in hese
3-u know the cat is absolutely under ur own control ! that's just a demo ! u can have as many cats and sub-cats as u wish !
Hope this was useful ! Classipress 3.1 is full of useful options much much better than what u c now !